Fan



FIG. 1 is a bottom perspective view of my design for a fan;

FIG. 2 is a top perspective view of the fan;

FIG. 3 is a front view of the fan, the rear view being a mirror image thereof;

FIG. 4 is a left side view of the fan, the right side view being a mirror image thereof;

FIG. 5 is a top view of the fan; and,

FIG. 6 is a bottom view of the fan.

The broken line depictions of portions of the fan form no part of the claimed design. 

CLAIM The ornamental design for a fan, as shown and described. 